DiMaria::get() - Code Metrics - Inspection of "added newInstance methodx" - dangerousdan/DiMaria - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 6c281c...502620 )

by Dangerous

created 2016-04-03 19:47 UTC

DiMaria::get() A

↳ Parent: DiMaria

Complexity

Conditions	4
Paths	3

Size

Total Lines	11
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	3
CRAP Score	4

Metric	Value
dl	0
loc	11
ccs	3
cts	3
cp	1
rs	9.2
cc	4
eloc	7
nc	3
nop	2
crap	4

<?php
namespace DD;

use DD\DiMaria\Exception\DiMariaException;
use DD\DiMaria\Exception\NotFoundException;
use Interop\Container\ContainerInterface;

/**
 * DiMaria Dependency injector
 */
class DiMaria implements ContainerInterface
{
    protected $preferences = [];
    protected $aliases = [];
    protected $cache = [];
    protected $injections = [];
    protected $params = [];
    protected $shared = [];
    protected $sharedInstance = [];

    /**
     * Set a preferred implementation of a class/interface
     * @param string $alias  the name of the alias
     * @param string $class  the name of the class/interface
     * @return self
     */
    public function setPreference(string $alias, string $class): self
    {
        $this->preferences[$alias] = $class;
        return $this;
    }

    /**
     * Alias a class/interface/alias to a string.
     * @param string $alias   the name of the alias
     * @param string $class   the name of the class
     * @param array  $params  a key/value array of parameter names and values
     * @return self
     */
    public function setAlias(string $alias, string $class, array $params = []): self
    {
        $this->aliases[$alias] = [
            'class' => $class,
            'params' => $params
        ];
        return $this;
    }

    /**
     * Set rule to call a method after constructing a class
     * @param string $class the name of the class
     * @param string $method    the name of the method
     * @param array  $params    a key/value array of parameter names and values
     * @return self
     */
    public function setInjection(string $class, string $method, array $params = []): self
    {
        $this->injections[$class][$method][] = $params;
        return $this;
    }

    /**
     * Set parameters of a class
     * @param string $class the name of the class
     * @param array  $params    a key/value array of parameter names and values
     * @return self
     */
    public function setParams(string $class, array $params): self
    {
        $this->params[$class] = $params + ($this->params[$class] ?? []);
        return $this;
    }

    /**
     * Mark a class/alias as shared
     * @param string $class the name of class/alias
     * @return self
     */
    public function setShared(string $class): self
    {
        $this->shared[$class] = true;
        return $this;
    }

    public function has($class): bool
    {
        return class_exists($class) ?: isset($this->aliases[$class]) ?: isset($this->preferences[$class]);
    }

    /**
     * Get an instance of a class
     * @param  string $class  the name of class/alias to create
     * @param  array $params  a key/value array of parameter names and values
     * @return mixed          an instance of the class requested
     */
    public function get($class, array $params = [])
    {
        if (isset($this->shared[$class]) && isset($this->sharedInstance[$class])) {
            return $this->sharedInstance[$class];
        }
        $object = $this->newInstance($class, $params);
        if (isset($this->shared[$originalClass])) {
            $this->sharedInstance[$originalClass] = $object;

        }
        return $object;
    }

    /**
     * Get a new instance of a class
     * @param  string $class  the name of class/alias to create
     * @param  array $params  a key/value array of parameter names and values
     * @return mixed          an instance of the class requested
     */
    public function newInstance(string $class, array $params = [])
    {
        if (! $this->has($class)) {
            throw new NotFoundException('Class or alias ' . $class . ' does not exist');
        }
        while ($preference = $this->preferences[$class] ?? false) {
            $class = $preference;
        }
        $originalClass = $class;
        while ($alias = $this->aliases[$class] ?? false) {
            $params = $params + $alias['params'];
            $class = $alias['class'];
        }
        try {
            $callback = $this->cache[$originalClass] ?? $this->cache[$originalClass] = $this->getCallback($class, $originalClass);
            return $callback($params);
        } catch (\Exception $e) {
            throw new ContainerException($e->getMessage(), $e->getCode(), $e);
        } catch (\Error $e) {
            throw new ContainerException($e->getMessage(), $e->getCode(), $e);
        }
    }

    protected function getCallback(string $class, string $originalClass): callable
    {
        $callback = $this->generateCallback($class);
        if (isset($this->injections[$originalClass])) {
            foreach ($this->injections[$originalClass] as $method => $instance) {
                $methodInfo = $this->getMethodInfo(new \ReflectionMethod($class, $method));
                foreach ($instance as $methodParameters) {
                    $methodParams = $this->getParameters($methodInfo, $methodParameters);
                    $callback = function ($params) use ($callback, $method, $methodParams) {
                        $object = $callback($params);
                        $object->$method(...$methodParams);
                        return $object;
                    };
                };
            }
        }
        return $callback;
    }

    protected function generateCallback(string $class): callable
    {
        $constructor = (new \ReflectionClass($class))->getConstructor();
        if (! $constructor || ! $constructor->getNumberOfParameters()) {
            return function () use ($class) {
                return new $class;
            };
        }
        $constructorInfo = $this->getMethodInfo($constructor);
        $predefinedParams = $this->params[$class] ?? [];

        return function ($params) use ($class, $constructorInfo, $predefinedParams) {
            return new $class(...$this->getParameters($constructorInfo, $params + $predefinedParams));
        };
    }

    protected function getMethodInfo(\ReflectionMethod $method): array
    {
        $paramInfo = [];
        foreach ($method->getParameters() as $param) {
            $paramType = $param->hasType() ? $param->getType() : null;
            $paramType = $paramType ? $paramType->isBuiltin() ? null : $paramType->__toString() : null;
            $paramInfo[$param->name] = [
                'name' => $param->name,
                'optional' => $param->isOptional(),
                'default' => $param->isOptional() ? ($param->isVariadic() ? null : $param->getDefaultValue()) : null,
                'variadic' => $param->isVariadic(),
                'type' => $paramType,
            ];
        }
        return $paramInfo;
    }

    public function getParameters(array $methodInfo, array $params): array
    {
        $parameters = [];
        foreach ($methodInfo as $param) {
            if (isset($params[$param['name']])) {
                array_push($parameters, ...$this->determineParameter($params[$param['name']], $param['variadic']));
            } elseif ($param['optional']) {
                if ($param['variadic']) {
                    break;
                }
                $parameters[] = $param['default'];
            } elseif ($param['type']) {
                $parameters[] = $this->get($param['type']);
            } else {
                throw new ContainerException('Required parameter $' . $param['name'] . ' is missing');
            }
        }
        return $parameters;
    }

    protected function determineParameter($param, bool $isVariadic): array
    {
        if (is_array($param)) {
            if ($isVariadic) {
                $params = [];
                foreach ($param as $val) {
                    $params[] = isset($val['instanceOf']) ? $this->get($val['instanceOf'], $val['params'] ?? []) : $val;
                }
                return $params;
            }
            return isset($param['instanceOf']) ? [$this->get($param['instanceOf'], $param['params'] ?? [])] : [$param];
        }
        return [$param];
    }
}


1		<?php
2		namespace DD;
3
4		use DD\DiMaria\Exception\DiMariaException;
5		use DD\DiMaria\Exception\NotFoundException;
6		use Interop\Container\ContainerInterface;
7
8		/**
9		* DiMaria Dependency injector
10		*/
11		class DiMaria implements ContainerInterface
12		{
13		protected $preferences = [];
14		protected $aliases = [];
15		protected $cache = [];
16		protected $injections = [];
17		protected $params = [];
18		protected $shared = [];
19		protected $sharedInstance = [];
20
21		/**
22	3	* Set a preferred implementation of a class/interface
23		* @param string $alias the name of the alias
24	3	* @param string $class the name of the class/interface
25	3	* @return self
26	3	*/
27	3	public function setPreference(string $alias, string $class): self
28	3	{
29		$this->preferences[$alias] = $class;
30	3	return $this;
31	1	}
32
33	3	/**
34	1	* Alias a class/interface/alias to a string.
35		* @param string $alias the name of the alias
36	3	* @param string $class the name of the class
37	1	* @param array $params a key/value array of parameter names and values
38		* @return self
39	3	*/
40	1	public function setAlias(string $alias, string $class, array $params = []): self
41	1	{
42		$this->aliases[$alias] = [
43		'class' => $class,
44	3	'params' => $params
45	1	];
46	1	return $this;
47		}
48
49	3	/**
50		* Set rule to call a method after constructing a class
51		* @param string $class the name of the class
52		* @param string $method the name of the method
53		* @param array $params a key/value array of parameter names and values
54		* @return self
55		*/
56		public function setInjection(string $class, string $method, array $params = []): self
57		{
58	4	$this->injections[$class][$method][] = $params;
59		return $this;
60	4	}
61	4
62		/**
63		* Set parameters of a class
64		* @param string $class the name of the class
65		* @param array $params a key/value array of parameter names and values
66		* @return self
67		*/
68		public function setParams(string $class, array $params): self
69		{
70		$this->params[$class] = $params + ($this->params[$class] ?? []);
71	23	return $this;
72		}
73	23
74	23	/**
75	23	* Mark a class/alias as shared
76		* @param string $class the name of class/alias
77	23	* @return self
78		*/
79		public function setShared(string $class): self
80		{
81		$this->shared[$class] = true;
82		return $this;
83		}
84
85		public function has($class): bool
86		{
87	19	return class_exists($class) ?: isset($this->aliases[$class]) ?: isset($this->preferences[$class]);
88		}
89	19
90	19	/**
91		* Get an instance of a class
92		* @param string $class the name of class/alias to create
93		* @param array $params a key/value array of parameter names and values
94		* @return mixed an instance of the class requested
95		*/
96		public function get($class, array $params = [])
97		{
98		if (isset($this->shared[$class]) && isset($this->sharedInstance[$class])) {
99	21	return $this->sharedInstance[$class];
100		}
101	21	$object = $this->newInstance($class, $params);
102	21	if (isset($this->shared[$originalClass])) {
103		$this->sharedInstance[$originalClass] = $object;
		0 ignored issues – show Bug introduced 2016-04-03 19:49 UTC by Report Bug Copy Issue Report The variable `$originalClass` does not exist. Did you forget to declare it? This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug. Loading history...
104		}
105		return $object;
106		}
107
108		/**
109		* Get a new instance of a class
110	4	* @param string $class the name of class/alias to create
111		* @param array $params a key/value array of parameter names and values
112	4	* @return mixed an instance of the class requested
113	4	*/
114		public function newInstance(string $class, array $params = [])
115		{
116		if (! $this->has($class)) {
117		throw new NotFoundException('Class or alias ' . $class . ' does not exist');
118		}
119		while ($preference = $this->preferences[$class] ?? false) {
120		$class = $preference;
121		}
122	58	$originalClass = $class;
123		while ($alias = $this->aliases[$class] ?? false) {
124	58	$params = $params + $alias['params'];
125	3	$class = $alias['class'];
126		}
127	58	try {
128	4	$callback = $this->cache[$originalClass] ?? $this->cache[$originalClass] = $this->getCallback($class, $originalClass);
129		return $callback($params);
130	58	} catch (\Exception $e) {
131	58	throw new ContainerException($e->getMessage(), $e->getCode(), $e);
132	22	} catch (\Error $e) {
133	22	throw new ContainerException($e->getMessage(), $e->getCode(), $e);
134		}
135	58	}
136	58
137	56	protected function getCallback(string $class, string $originalClass): callable
138	4	{
139		$callback = $this->generateCallback($class);
140	56	if (isset($this->injections[$originalClass])) {
141		foreach ($this->injections[$originalClass] as $method => $instance) {
142		$methodInfo = $this->getMethodInfo(new \ReflectionMethod($class, $method));
143	58	foreach ($instance as $methodParameters) {
144		$methodParams = $this->getParameters($methodInfo, $methodParameters);
145	58	$callback = function ($params) use ($callback, $method, $methodParams) {
146	58	$object = $callback($params);
147	18	$object->$method(...$methodParams);
148	18	return $object;
149	18	};
150	18	};
151		}
152	18	}
153	18	return $callback;
154	18	}
155	18
156		protected function generateCallback(string $class): callable
157		{
158		$constructor = (new \ReflectionClass($class))->getConstructor();
159	58	if (! $constructor \|\| ! $constructor->getNumberOfParameters()) {
160	58	return function () use ($class) {
161		return new $class;
162		};
163	58	}
164		$constructorInfo = $this->getMethodInfo($constructor);
165	58	$predefinedParams = $this->params[$class] ?? [];
166	58
167		return function ($params) use ($class, $constructorInfo, $predefinedParams) {
168	29	return new $class(...$this->getParameters($constructorInfo, $params + $predefinedParams));
169	29	};
170		}
171	40
172	40	protected function getMethodInfo(\ReflectionMethod $method): array
173	40	{
174	40	$paramInfo = [];
175	40	foreach ($method->getParameters() as $param) {
176		$paramType = $param->hasType() ? $param->getType() : null;
177		$paramType = $paramType ? $paramType->isBuiltin() ? null : $paramType->__toString() : null;
178	56	$paramInfo[$param->name] = [
179		'name' => $param->name,
180	56	'optional' => $param->isOptional(),
181	56	'default' => $param->isOptional() ? ($param->isVariadic() ? null : $param->getDefaultValue()) : null,
182	53	'variadic' => $param->isVariadic(),
183	53	'type' => $paramType,
184	53	];
185	53	}
186	53	return $paramInfo;
187	53	}
188	53
189	53	public function getParameters(array $methodInfo, array $params): array
190		{
191		$parameters = [];
192	56	foreach ($methodInfo as $param) {
193		if (isset($params[$param['name']])) {
194		array_push($parameters, ...$this->determineParameter($params[$param['name']], $param['variadic']));
195	56	} elseif ($param['optional']) {
196		if ($param['variadic']) {
197	56	break;
198	56	}
199	53	$parameters[] = $param['default'];
200	39	} elseif ($param['type']) {
201	29	$parameters[] = $this->get($param['type']);
202	26	} else {
203	4	throw new ContainerException('Required parameter $' . $param['name'] . ' is missing');
204		}
205	22	}
206	15	return $parameters;
207	13	}
208
209	51	protected function determineParameter($param, bool $isVariadic): array
210		{
211		if (is_array($param)) {
212	54	if ($isVariadic) {
213		$params = [];
214		foreach ($param as $val) {
215	39	$params[] = isset($val['instanceOf']) ? $this->get($val['instanceOf'], $val['params'] ?? []) : $val;
216		}
217	39	return $params;
218	15	}
219	7	return isset($param['instanceOf']) ? [$this->get($param['instanceOf'], $param['params'] ?? [])] : [$param];
220	7	}
221	7	return [$param];
222		}
223		}
224

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